Small research in a helmet

I am designing a night ride helmet it’s basically a motorcycle helmet that much safer in the rode for rider that has break light and turn right and left light on the helmet it self that’s is connect with the motorcycle. My questions are what’s the actual size and weight of and helmet
Draw some good design
What an led should we use ,why we using this led and how many led we have buy to put in the helmet
Just do a small research it would take that long
Let me know if u need more expl